cluster/certs: remove old kube CA

This completes the migration away from the old CA/cert infrastructure.

The tool which was used to generate all these certs will come next. It's
effectively a reimplementation of clustercfg in Go.

We also removed the unused kube-serviceaccounts cert, which was
generated by the old tooling for no good reason (we only need a key for
service accounts, not an actual cert...).

Change-Id: Ied9e5d8fc90c64a6b4b9fdd20c33981410c884b4
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1501
Reviewed-by: q3k <q3k@hackerspace.pl>
diff --git a/cluster/certs/ca-kube.crt b/cluster/certs/ca-kube.crt
index c44255e..825ae1f 100644
--- a/cluster/certs/ca-kube.crt
+++ b/cluster/certs/ca-kube.crt
@@ -1,23 +1,10 @@
 -----BEGIN CERTIFICATE-----
-MIID2DCCAsCgAwIBAgIUfa+oMG9sYHFeuhBgb8wSWHJ7ozUwDQYJKoZIhvcNAQEL
-BQAwgYMxCzAJBgNVBAYTAlBMMRQwEgYDVQQIEwtNYXpvd2llY2tpZTEPMA0GA1UE
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++S29scjKwxjnnX0eLephWLyFrbIxzh3bAA==
 -----END CERTIFICATE-----